250 



VASIL OBRESHKOVE 



smooth curve is obtained (fig. 2). This curve is hyperboHc 

 (curve A) and indicates that as one of the variables increases, 

 the other decreases — in this case, according to a constancy, a 

 relation which is retained throughout the whole series of experi- 

 ments. By the method of least squares from 



{X - a) {y -h) = C, 



computing for three constants and employing the summary 



Lo^. of reactfon-tiTne 



to 



o 



Sntensify-Cand/e meters 



Fig. 2 Curve A illustrates the data in table 2 and represents the relation 

 between the intensity of light and reaction-time. Curve B gives the logarithmic 

 relation between the intensity of light and reaction-time of the same data. 



results in table 2, it was found that the data can be represented 

 by the formula: 



{x - 0.15) (?/ - 2.85) = 94.48 or 

 94.48 



y = 



X - 0.15 



-i-2.85 



